iTunes 11 has a whole new interface, and part of that is a drop-down menu that shows your different media. Thankfully, Mac OS X Hints points to the keyboard shortcuts that make the process of flipping through them a lot easier.

Instead of clicking through the drop-down menu, you can use these shortcuts:

Ctrl + 1 on Windows (Cmd + 1 on Mac) = Music

Ctrl + 2 on Windows (Cmd + 2 on Mac)= Movies

Ctrl + 3 on Windows (Cmd + 3 on Mac) = TV Shows

Ctrl + 4 on Windows (Cmd + 4 on Mac) = Podcasts

Ctrl + 5 on Windows (Cmd + 5 on Mac) = iTunes U

Ctrl + 6 on Windows (Cmd + 6 on Mac) = Books

Ctrl + 7 on Windows (Cmd + 7 on Mac) = Apps

Of course, if you really don't like the drop-down menu, you can also bring back the sidebar to easily select the different selections as well.